The recent case of Re CA and Ors (Children of Unregulated Sperm Donor) [2025] EWFC 130 brings into focus the threats posed by unregulated sperm donation, specifically at the hand of serial sperm donor known as ‘Joe Donor’. In this case, Mr Justice Poole determines whether ‘Joe Donor’ – officially named Robert Albon – has any rights to a Declaration of Parentage, a Parental Responsibility Order and a Child Arrangements Order for two of the possible 180 children he has fathered. The case also brings to light the vulnerabilities of the two children’s mothers and raises concerns about exploitation and abuse that can accompany informal sperm donation, and what this means for the best interests of the children involved.